What will be the impact when you change ‘reportingrange1a’ from 3 to 4 dB and ‘timetotrigger1a’ 100 to 320 ms, without changing any other parameters?

• Reduction in number of Event1a
• Delayed Event1a trigger
• Reduction in Average Active Set Size
• Delay in Event1a could increase DL interference, which could lead to a drop call or increase in Average Power Per User (reduction in cell capacity)

What are the possible causes for an IRAT Failure?

There are several reasons for IRAT failure in cellular network optimization.
Major 4 reasons which played good role in WCDMA Optimization.

·         Missing 2G relations

·         Non availability of 2G Resources

·         Poor 2G Coverage

·         Missing 3G Relations

What are the conditions you typically set to trigger IRAT handover?

RSCP and Ec/Io are used to trigger IRAT handover:

1.       RSCP ≤ -100dBm.

2.       Ec/Io ≤ -16dBm.

Find more document on IRAT
WCDMA IRAT Handover
Details on IRAT Parameter Optimization Document

How many types of handovers are there in UMTS?

• Soft/Softer Handover
• Inter Frequency Handover
• Inter RAT Handover
• Core Network Hard Handover
• Service based handover to GSM
• HSDPA Mobility

Download UMTS Basic Understanding Document